mineral
Possible magnetite fragment
Magnetite (Fe₃O₄), tentative identification
AI-generated identification · may be incorrectSmall, dark gray to black fragment with metallic-to-submetallic luster and irregular surfaces. Magnetite has Mohs hardness 5.5–6.5, a cubic crystal structure, and no prominent cleavage; magnetism would help confirm it.
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Physical properties
Small, dark gray to black fragment with metallic-to-submetallic luster and irregular surfaces. Magnetite has Mohs hardness 5.5–6.5, a cubic crystal structure, and no prominent cleavage; magnetism would help confirm it.
Formation & geological history
Magnetite forms in igneous and metamorphic rocks and in iron-rich sedimentary deposits; the specimen’s geological age and source cannot be determined from the image.
Uses & applications
Magnetite is an important iron ore and is collected as mineral specimens; this tiny fragment has little practical or jewelry value.
Geological facts
Its strong magnetic response is a useful diagnostic property, though some other minerals can also be weakly magnetic.
Field identification & locations
The black, shiny appearance is consistent with magnetite but not diagnostic; test with a magnet and check for a black streak. It occurs worldwide in iron deposits and many igneous rocks.
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